Xcalday is an excellent tool for keeping track of your notifications by day. You simply need to click on a day to choose it, and then put your message in the bottom box.
When a note is added to a day, the day becomes bold. To remove a note, just erase the text; the day will no longer be bold.
Using Xcal Day is as easy as selecting a day and entering the desired message. In addition, to prevent clipping, days with annotations will be marked in bold in the calendar.
Xcalday does not demand more from your computer; it operates at a low level on your disk and has no effect on other programs. Because all notes are kept in a simple text file, your registry will not be altered.